Abstract

The high pressure and high temperature (HPHT) synthesis method is useful in developing metal intercalated silicon clathrate compounds. The barium containing binary type I clathrate compound Ba8Si46 can be prepared under HPHT conditions of 3 GPa at 800 °C, and becomes a superconductor with a transition temperature T c of 8.0 K. A variety of clathrate related compounds with covalently bonded nano-cage structures have been prepared using HPHT conditions with most showing superconductivity. An attempt to prepare carbon analogs of silicon clathrate compounds by the HPHT 3D polymerization of C60 is also introduced.

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